CN111405707B

CN111405707B - LED (light-emitting diode) floodlight circuit for vehicle

Info

Publication number: CN111405707B
Application number: CN202010264980.1A
Authority: CN
Inventors: 吕晓峰; 夏倩; 李军; 葛明; 章海燕
Original assignee: Hefei Yuanhui Optoelectronic Co ltd
Current assignee: Hefei Yuanhui Optoelectronic Co ltd
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2022-04-22
Anticipated expiration: 2040-04-07
Also published as: CN111405707A

Abstract

The invention discloses an LED (light emitting diode) streamer lamp circuit for a vehicle, which comprises a DC-DC power circuit (1), a programmable LED driving circuit (2), a turn light signal delay circuit (3) and an LED light source group (4); the output low-voltage direct-current voltage of the DC-DC (1) is supplied to the programmable LED driving circuit (2), one end of the programmable LED driving circuit (2) collects the voltage signal sent by the turn signal delay circuit (3), and the other end of the programmable LED driving circuit is connected with the LED light source group (4). When the automobile gives a steering signal, a group of luminous steering lamp light sources can move transversely, so that front and rear vehicles and pedestrians can be better reminded that the automobile is about to turn, change lanes and the like.

Description

LED (light-emitting diode) floodlight circuit for vehicle

The technical field is as follows:

the invention relates to an LED (light-emitting diode) streamer lamp circuit for a vehicle, which can enable a part of luminous lamp beads in a group of LED lamp beads to flow in one direction and can control the flow and the turn-off of a lamp bead light source according to an external trigger signal.

Background art:

currently, LEDs are commonly used in automotive lighting and signaling devices. However, most of the light emitted by these automotive LED lamps is fixed at a certain position and does not move. In recent years, some large vehicles use LED lamps with changeable colors at the tail part to remind the following vehicles to keep the distance. There are also some cars that have the turn signal light turned on from the inside, then the lit portion extended outward, and then turned on to the outermost side and then from the beginning, and the cycle is cycled until the turn signal light is turned off. During the running process of the vehicle, the driver has much lower sensitivity to the longitudinal movement of the front vehicle than the lateral movement. Therefore, the light source of the steering lamp can move transversely, so that the front and rear vehicles and personnel can be helped to identify the steering signal of the vehicle, and the driving safety is improved.

Disclosure of Invention

In order to better prompt a vehicle behind in the processes of turning, emergency parking, fault parking, lane changing, rain and fog weather driving and the like, the invention provides a vehicular streamer steering lamp circuit, which can drive part of lamp beads in a group of LED light sources to move from one side to the other side one by one. When the steering lamp is installed on a vehicle, the steering lamp can move step by step from inside to outside and also can move step by step from bottom to top, so that the transverse displacement is generated in the vision of other people, people can more easily identify the motion state and direction and distance of the vehicle, and the steering lamp really plays a role in leading and steering. Let the indicator light source lateral shifting, will help front and back vehicle to discern the turn signal of this car, promote driving safety.

In order to achieve the purpose, the invention adopts the following technical scheme:

a vehicle LED (light-emitting diode) streamer lamp circuit comprises a DC-DC power circuit (1), a programmable LED driving circuit (2), a turn light signal delay circuit (3) and an LED light source group (4); the low-voltage direct-current voltage output by the DC-DC (1) is supplied to the programmable LED driving circuit (2), one end of the programmable LED driving circuit (2) collects the voltage signal sent by the turn signal delay circuit (3), and the other end of the programmable LED driving circuit is connected with the LED light source group (4).

When the automobile normally works, the automobile provides a direct current voltage for the DC-DC (1), the direct current voltage is converted into a low-voltage constant voltage for the programmable LED driving circuit (2) by the DC-DC (1), and the programmable LED driving circuit (2) determines whether to light the LED lamp bead and enable the LED lamp bead to flow light according to a signal sent by the turn signal delay circuit (3); when the turn signal is turned off, the turn signal delay circuit (3) controls the output of the programmable LED drive circuit (2) to be turned off; when the steering lamp is turned on, the steering lamp signal delay circuit (3) receives the steering signal, then reduces the voltage of the steering signal, clamps the steering signal, appropriately delays the steering signal and controls the programmable LED drive circuit (2); the delay is required in consideration of the fact that the signal is often intermittent, and therefore the intermittent signal is converted into a continuous signal by a delay circuit, and the signal level is clamped. If the turn signal adopts a continuous signal, the turn signal delay circuit (3) clamps the signal level only. When the turn signal delay circuit (3) provides continuous turn signals to the programmable LED drive circuit (2), the programmable LED drive circuit (2) drives a part of light sources in the LED light source group (4) to start shifting (streamer).

The invention has the advantages that after the automobile gives a steering signal, a group of luminous steering lamp light sources can transversely move so as to better remind the front and the rear vehicles and pedestrians that the vehicle is about to steer, change lanes and the like.

Description of the drawings:

in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a circuit schematic of the present invention;

FIG. 2 is a circuit diagram of a first embodiment of the present invention;

FIG. 3 is a circuit diagram of a second embodiment of the present invention;

fig. 4 is a circuit diagram of a third embodiment of the present invention.

The specific implementation structure is as follows:

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A vehicle LED (light-emitting diode) streamer lamp circuit comprises a DC-DC power supply circuit 1, a programmable LED drive circuit 2, a turn light signal delay circuit 3 and an LED light source group 4; in fig. 1, one port of a DC-DC power circuit 1 is connected to one end of a programmable LED driving circuit 2, a signal receiving end of the programmable LED driving circuit 2 is connected to a turn signal delay circuit 3, and an output end of the programmable LED driving circuit 2 is connected to an LED light source group 4.

In normal operation, the DC-DC power supply circuit 1 converts the supply voltage on the vehicle into an operating voltage for the CPU in the programmable LED driver circuit 2. The turn signal delay circuit 3 converts the intermittent or continuous turn signal on the vehicle into a continuous level signal which can be accepted by the CPU, so that the programmable LED drive circuit 2 can judge whether the light needs to be turned on and the light flows. When the turn signal light comes and needs to be lighted and light flows, the programmable LED driving circuit 2 drives the LED light source group 4 to start lighting. The LED light source groups 4 are not arranged in numerical order in the figure, but are plotted according to the positions of the numbers of the CPU interfaces.

In fig. 2, one port of the DC-DC power circuit 1 is connected to one end of the programmable LED driving circuit 2, a signal receiving end of the programmable LED driving circuit 2 is connected to the turn signal delay circuit 3, and an output end of the programmable LED driving circuit 2 is connected to the LED light source group 4. The DC-DC power supply circuit 1 is composed of capacitors C101-105, resistors R101-R105, an inductor L101 and a buck switching power supply controller U101. The programmable LED drive circuit 2 is composed of a CPU chip U201 and resistors R201-R216. The turn signal delay circuit 3 is composed of a diode D301, resistors R301 and R302, a capacitor C301 and a light emitting diode LED 301. The LED light source group 4 is composed of light emitting diodes LED 401-LED 416.

The DC-DC power circuit 1 receives the DC voltage provided by the automobile battery or the power supply, converts the DC voltage into a voltage of about 3.3V, and supplies power for the programmable LED drive circuit 2. The turn signal delay circuit 3 converts the intermittent or continuous turn signal on the vehicle into a continuous level signal which can be accepted by the CPU, so that the programmable LED drive circuit 2 can judge whether the light needs to be turned on and the light flows. When the turn signal is received by the turn signal delay circuit 3, the turn signal is immediately provided to the signal acquisition port of the programmable LED drive circuit 2. When the signal acquisition port of the programmable LED driving circuit 2 acquires that a signal arrives, the CPU is informed to output the driving ports to start outputting in sequence, a plurality of adjacent light sources in the LED light source group 4 are driven to continuously move towards a certain direction, and the process is repeated after the last position of the light sources is completely moved out until the signal of the turn light is turned off. In this embodiment, 6 adjacent LED light sources are selected by a program to be turned on and shifted, and the practical effect is that, when a turn signal is provided to a light source group consisting of 16 LEDs, the 6 adjacent LED light sources are shifted in the same direction, so as to give a feeling of streamer light. The circuit is suitable for a system that a vehicle can continuously provide voltage for the circuit and the circuit waits for a steering signal to arrive. When no steering signal exists, the output end of the steering lamp signal delay circuit 3 is at a low level, and the programmable LED drive circuit 2 does not output. When the power supply signal comes, whether intermittently or continuously, the output end of the turn signal delay circuit 3 changes to high level, and the programmable LED driving circuit 2 starts to drive the adjacent LED light sources to sequentially turn on.

In fig. 3, one port of the DC-DC power circuit 1 is connected to one end of the programmable LED driving circuit 2, a signal receiving end of the programmable LED driving circuit 2 is connected to the turn signal delay circuit 3, and an output end of the programmable LED driving circuit 2 is connected to the LED light source group 4. The DC-DC power supply circuit 1 is composed of capacitors C101-105, resistors R101-R105, an inductor L101 and a buck switching power supply controller U101. The programmable LED drive circuit 2 is composed of a CPU chip U201 and resistors R401-R416. The turn signal delay circuit 3 is eliminated, and the output end is suspended or directly connected with Vcc. The LED light source group 4 is composed of light emitting diodes LED 401-LED 416. The DC-DC power circuit 1 receives intermittent voltage provided by an automobile circuit, when the voltage is available, the circuit can store more electric quantity on a capacitor C101, and meanwhile, the DC-DC power circuit outputs about 3.3V voltage to a programmable LED driving circuit 2; during intermittent power-off, the higher voltage stored in the capacitor C101 slowly discharges to continuously supply power to the buck-type switching power supply controller U101, so that the output of the DC-DC power supply circuit 1 is kept unchanged, the CPU in the programmable LED driving circuit 2 continuously operates, and the continuous power supply time is longer than the intermittent power-off time. The P5.5 port of the programmable LED driving circuit 2 is designed to be high level effective and high level when suspended, so that other components do not need to be connected, and the P5.5 port can also be directly connected with the power supply voltage Vcc of the CPU chip; under the two conditions, as long as the power supply is powered on, the CPU can normally work, the output driving port starts to sequentially output, a plurality of adjacent light sources in the LED light source group 4 are driven to continuously move towards a certain direction, and the operation is repeated after the adjacent light sources are completely moved out until the power supply of the turn light is turned off. In this embodiment, 6 adjacent LED light sources are selected by a program to be turned on and shifted, and the practical effect is that, when a turn signal is provided to a light source group consisting of 16 LEDs, the 6 adjacent LED light sources are shifted in the same direction, so as to give a feeling of streamer light. The embodiment is suitable for replacing the steering lamp of the existing automobile steering lamp system, and can directly provide the steering lamp with the circuit in an intermittent power supply mode.

In fig. 4, one port of the DC-DC power circuit 1 is connected to one end of the programmable LED driving circuit 2, a signal receiving end of the programmable LED driving circuit 2 is connected to the turn signal delay circuit 3, and an output end of the programmable LED driving circuit 2 is connected to the LED light source group 4. The DC-DC power supply circuit 1 is composed of capacitors C101-105, resistors R101-R105, an inductor L101 and a buck switching power supply controller U101. The programmable LED drive circuit 2 is composed of a CPU chip U201, resistors R201-R216 and triodes Q201-Q216. The turn signal delay circuit 3 is eliminated, and the output end is suspended or directly connected with Vcc. The LED light source group 4 is composed of light emitting diodes LED 401-LED 416. The DC-DC power circuit 1 receives the DC voltage provided by the automobile battery or the power supply, converts the DC voltage into a voltage of about 3.3V, and supplies power for the programmable LED drive circuit 2. The P5.5 port of the programmable LED driving circuit 2 is designed to be high level effective and high level when suspended, so that other components do not need to be connected, and the P5.5 port can also be directly connected with the power supply voltage Vcc of the CPU chip; under the two conditions, as long as the power supply is powered on, the CPU can normally work, the output driving port starts to sequentially output, a plurality of adjacent light sources in the LED light source group 4 are driven to continuously move towards a certain direction, and the operation is repeated after the adjacent light sources are completely moved out until the power supply of the turn light is turned off. In this embodiment, 6 adjacent LED light sources are selected by a program to be turned on and shifted, and the practical effect is that, when a turn signal is provided to a light source group consisting of 16 LEDs, the 6 adjacent LED light sources are shifted in the same direction, so as to give a feeling of streamer light. The embodiment is suitable for a system which has designed a circuit into the system when an automobile factory is designed and can continuously supply power when the turn light is turned on, but in order to improve the brightness, a driving triode is additionally arranged on each LED.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a vehicle LED flowing light circuit which characterized in that: the LED traffic light comprises a DC-DC power circuit (1), a programmable LED driving circuit (2), a turn signal delay circuit (3) and an LED light source group (4); the output low-voltage direct-current voltage of the DC-DC power circuit (1) is supplied to the programmable LED driving circuit (2), one end of the programmable LED driving circuit (2) collects a voltage signal sent by the turn signal delay circuit (3), the other end of the programmable LED driving circuit is connected with the LED light source group (4), and the DC-DC power circuit receives the direct-current voltage provided by the automobile storage battery or the power supply, converts the direct-current voltage into about 3.3V voltage and supplies power for the programmable LED driving circuit; the steering lamp signal delay circuit converts an intermittent or continuous steering signal on the vehicle into a continuous level signal which can be accepted by the CPU, and the level signal is used for the programmable LED driving circuit to judge whether the lamp needs to be turned on and the light flows; when the signal acquisition port of the programmable LED driving circuit acquires that a signal arrives, the CPU is informed to output the driving port in sequence, a plurality of adjacent light sources in the LED light source group are driven to continuously move towards a certain direction, and the operation is repeated after the last position of the light sources is completely moved out until the signal of the turn light is turned off.

2. The LED floodlight circuit for a vehicle according to claim 1, wherein: the DC-DC power supply circuit (1) is composed of capacitors C101-105, resistors R101-R105, an inductor L101 and a buck switching power supply controller U101.

3. The LED floodlight circuit for a vehicle according to claim 1, wherein: the programmable LED drive circuit (2) is composed of a CPU chip U201 and resistors R201-R216.

4. The LED floodlight circuit for a vehicle according to claim 1, wherein: the turn signal delay circuit (3) is composed of a diode D301, resistors R301 and R302, a capacitor C301 and a light emitting diode LED 301.

5. The LED floodlight circuit for a vehicle according to claim 1, wherein: the LED light source group (4) is composed of light emitting diodes (LED 401-LED 416).